Catalyst for hydrodechlorination of chlorosilanes to hydrogen silanes and method for implementing hydrogen silanes using said catalyst
a technology of chlorosilane and hydrogen silane, which is applied in the direction of physical/chemical process catalysts, metal/metal-oxide/metal-hydroxide catalysts, silicon compounds, etc., can solve the problems of increasing the energy requirement of the process and thus the cost, uneconomical processes, and significant amounts of by-products
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example 1
Hydrodechlorination of Tetrachlorosilane
[0029]30 g of pyrogenic silica is dispersed in 70 g of distilled water and metallic zinc corresponding to a proportion of 1% by weight based on the total solid is added to the composition. The composition is subsequently extruded to form extrudates and dried. 10 g of the dry catalyst are introduced into a tube reactor and firstly treated with hydrogen at 500° C. for hours. A mixture of 20% by volume of tetrachlorosilane in hydrogen is passed over the catalyst at 450° C. at a GHSV of 625 per hour and the composition of the exiting product mixture is determined by gas chromatography.
[0030]The amount of trichlorosilane formed is significantly above that corresponding to a stoichiometric reaction of 2 mol of SiHCl3 per mole of zinc. A TON (turnover number) of 225 was achieved up to the end of the experiment after about 48 hours.
example 2
Hydrodechlorination of Methyltrichlorosilane
[0031]30 g of pyrogenic silica is dispersed in 70 g of distilled water and metallic zinc corresponding to a proportion of 1% by weight based on the total solids is added to the composition. The composition is subsequently extruded to form extrudates, cut and dried using a ram extruder. 10 g of the dry catalyst are introduced into a tube reactor and firstly treated with hydrogen at 500° C. for 2 hours. A mixture of 20% by volume of methyltrichlorosilane in hydrogen is passed over the catalyst at 450° C. at a GHSV of 625 per hour and the chemical composition of the exiting product mixture is determined by gas chromatography.
[0032]At a theoretical stoichiometric conversion, a maximum of 2 mol of dichloromethylsilane would be formed per mole of zinc. The results show a significantly superstoichiometric formation of methyldichlorosilane as reaction product of the hydrodechlorination of methyltrichlorosilane, corresponding to a TON of 120 to con...
example 3
Hydrodechlorination of Methyltrichlorosilane
[0033]30 g of pyrogenic silica is dispersed in 70 g of distilled water and catalytically active metals corresponding to the following table in % by weight based on the total solids is added to the composition. The composition is subsequently extruded to form extrudates and dried. 10 g of the dry catalyst are introduced into a tube reactor and firstly treated with hydrogen at 500° C. for 2 hours. A mixture of 20% by volume of methyltrichlorosilane in hydrogen is passed over the catalyst at 450° C. at a GHSV of 625 h−1 and the chemical composition of the exiting product mixture is determined by gas chromatography. The results are shown in the form of the steady-state yields in the following table.
Active component(s)Yield25% by weight of Zn8.4%50% by weight of Zn2.7%75% by weight of Zn1.0%12.5% by weight of Zn, 12.5% by weight of Cu10.0%
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